From e389b4559960b1682adc79f323a9323b519f0b20 Mon Sep 17 00:00:00 2001
From: Mathias Froehlich <Mathias.Froehlich@web.de>
Date: Fri, 15 Jul 2011 17:42:19 +0200
Subject: [PATCH] Provide command line arguments for fgviewer.

Provide --fg-root and --fg-scenery command line
processing for fgviewer.
---
 utils/fgviewer/fgviewer.cxx | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/utils/fgviewer/fgviewer.cxx b/utils/fgviewer/fgviewer.cxx
index c65d8ebd6..a09cdf781 100644
--- a/utils/fgviewer/fgviewer.cxx
+++ b/utils/fgviewer/fgviewer.cxx
@@ -90,29 +90,31 @@ main(int argc, char** argv)
     fog->setDensity(1e-6);
     camera->getOrCreateStateSet()->setAttribute(fog);
 
-    const char *fg_root_env = std::getenv("FG_ROOT");
     std::string fg_root;
-    if (fg_root_env)
+    if (arguments.read("--fg-root", fg_root)) {
+    } else if (const char *fg_root_env = std::getenv("FG_ROOT")) {
         fg_root = fg_root_env;
-    else
+    } else {
 #if defined(PKGDATADIR)
         fg_root = PKGDATADIR;
 #else
         fg_root = ".";
 #endif
+    }
 
-    osgDB::FilePathList filePathList;
-    filePathList.push_back(fg_root);
-
-    const char *fg_scenery_env = std::getenv("FG_SCENERY");
+    std::string fg_scenery;
     string_list path_list;
-    if (fg_scenery_env) {
+    if (arguments.read("--fg-scenery", fg_scenery)) {
+        path_list.push_back(fg_scenery);
+    } else if (const char *fg_scenery_env = std::getenv("FG_SCENERY")) {
         path_list = sgPathSplit(fg_scenery_env);
     } else {
         SGPath path(fg_root);
         path.append("Scenery");
         path_list.push_back(path.str());
     }
+    osgDB::FilePathList filePathList;
+    filePathList.push_back(fg_root);
     for (unsigned i = 0; i < path_list.size(); ++i) {
         SGPath pt(path_list[i]), po(path_list[i]);
         pt.append("Terrain");
@@ -153,6 +155,10 @@ main(int argc, char** argv)
     btgOptions->getDatabasePathList() = filePathList;
     btgOptions->setMatlib(ml);
 
+    // Here, all arguments are processed
+    arguments.reportRemainingOptionsAsUnrecognized();
+    arguments.writeErrorMessages(std::cerr);
+
     // read the scene from the list of file specified command line args.
     osg::ref_ptr<osg::Node> loadedModel;
     loadedModel = osgDB::readNodeFiles(arguments, btgOptions);